<div class="article-points">
    <div class="value">{{article.votes}}</div>
    <div class="label">points</div>
</div>
<div class="article-operation">
    <div class="title">{{article.title}}<br /></div>
    <div class="link"><a href="{{article.link}}">{{article.link}}</a></div>
    <div class="link">domain: {{article.domain()}}</div>
    <ul class="operation">
        <li (click)="upvote()"><i nz-icon nzType="arrow-up" nzTheme="outline"></i>upvote</li>
        <li (click)="downvote()" [ngClass]="article.votes === 0 ? 'invalid' : ''"><i nz-icon nzType="arrow-down"
                nzTheme="outline"></i>downvote</li>
    </ul>
</div>